Quaternary multistratigraphic study of Borehole ZK10, Xinghua, Jiangsu Province
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摘要:
通过对江苏兴化ZK10孔岩石地层、生物地层、磁性地层及年代地层的研究,确定了该孔第四纪年代地层序列:①第四纪底界置于松山/高斯极性世分界处,埋深212m,距今2.58Ma。下更新统包括五队镇组下段、中段及上段的中下部,对应孢粉组合Ⅰ-1和Ⅰ-2。②早、中更新世界线与布容/松山极性世界线吻合,距今0.78Ma,埋深约120m,位于孢粉Ⅰ-2与Ⅱ带的分界处。中更新统包括五队镇组上段顶部、小腰庄组下段及上段的中下部。五队镇组是包含下、中更新统的跨时岩石地层单位。③中、晚更新世界线埋深81.5m,120ka BP左右,置于孢粉带Ⅱ与Ⅲ-1的分界处,与小腰庄组和灌南组分界线基本吻合。上更新统包括小腰庄组上段上部及灌南组。小腰庄组是包含中、上更新统的跨时地层单位。上更新统包括Ⅲ-1、Ⅲ-2、Ⅳ和Ⅴ孢粉带。④晚更新世与全新世界线埋深12.25m,距今10ka BP左右,位于Ⅴ与Ⅵ孢粉带分界处。全新统为淤尖组,对应孢粉Ⅵ带。
Abstract:Borehole ZK10 is located in Xinghua City, Jiangsu Province. Based on litho-, bio-, magneto- and chronostratigraphic study of the core sediments, the authors established its Quaternary chronological framework: ①The lower boundary of Quaternary, consistent with the G/M boundary at 2.58Ma, was found at 212m in depth. The Lower Pleistocene in this core was composed of the lower, middle members and lower to mid-parts of the upper member of the Wuduizhen Formation, and corresponded to the pollen zones Ⅰ-1 and Ⅰ-2. ②The Early/Middle Pleistocene boundary, in accord with the M/B boundary at 0.78Ma, was found at 120m. This was defined at the boundary between the pollen zones Ⅰ-1 and Ⅱ. The Middle Pleistocene was composed of the top part of upper member of Wuduizhen Formation and the lower member and the lower- to mid-parts of the upper member of the Xiaoyaozhuang Formation. The Wuduizhen Formation was a time-transgressive lithostratigraphical unit across the Lower/Middle Pleistocene. ③The Middle/Late Pleistocene boundary at 120ka BP was found at the depth of 81.5m. It lay on the boundary between the pollen zones Ⅱ and Ⅲ-1, and essentially coincided with the boundary between Xiaoyaozhuang Formation and Guannan Formation. The latter was another timetransgressive unit crossing both the Middle and Upper Pleistocene. The Upper Pleistocene was composed of the pollen zones Ⅲ-1, Ⅲ-2, Ⅳ and Ⅴ. ④The Late Pleistocene/Holocene boundary, about 10ka BP, 12.25m, lay on the pollen boundary between zones Ⅴ and Ⅵ. Lithostratigraphically, Holocene deposits belong to the Yujian Formation and correspond to the pollen zone Ⅵ.
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Keywords:
- Quaternary /
- ostracoda /
- sporopollen /
- palaeomagnetism /
- AMS 14C age
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致谢: 国土资源部地下水矿泉水及环境监测中心鉴定孢粉及介形类化石,南京地质调查中心实验室测量古地磁,北京大学考古文博学院AMS 14C 实验室测量14C 年龄,一并致谢。
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表 1 ZK10 孔介形类化石名单
Table 1 List of ostracoda fossils of Borehole ZK10
样品编号 化石名称 生存环境 WT13 Neomonoceratina dongtaiensis Yang et Chen东台新单角介 海相 Sinocythere dongtaiensis Yang et Chen东台中华花介 海相 Tanella opima Chen丰满陈氏介 海相 WT19 Loxoconcha binhaiensis Ho滨海弯背介 海相 Sinocyther ideaimpressa (Brady) 凹陷中华美花介 广盐性种 Sinocythere dongtaiensis Yang et Chen东台中华花介 海相 WT20 Sinocyther ideaimpressa (Brady) 凹陷中华美花介 广盐性种 WT22 Cushmanidea japonica Hanai日本库士曼介 海相 Cushmanidea triangulate Hou三角库士曼介 海相 Loxoconcha binhaiensis Ho滨海弯背介 海相 Munseyella japonica (Hanai) 日本穆赛介 海相 Neomonoceratina dongtaiensis Yang et Chen东台新单角介 海相 Sinocytheridea impressa (Brady) 凹陷中华美花介 广盐性种 Sinocythere dongtaiensis Yang et Chen东台中华花介 海相 WT23 Neomonoceratina dongtaiensis Yang et Chen东台新单角介 海相 Sinocytheridea impressa (Brady) 凹陷中华美花介 广盐性种 Spinileberis sinensis Chen中华刺面介 海相 WT24 Neomonoceratina dongtaiensis Yang et Chen东台新单角介 海相 WT25 Bicornucythere bisanensis (Okuba)皮桑双角花介 海相 Cushmanidea japonica Hanai日本库士曼介 海相 Bythoceratina sp. 深海角介(未定种) 海相 Neomonoceratina dongtaiensis Yang et Chen东台新单角介 海相 Sinocytheridea impressa (Brady) 凹陷中华美花介 广盐性种 Sinocythere dongtaiensis Yang et Chen东台中华花介 海相 WT26 Bicornucythere bisanensis (Okuba) 皮桑双角花介 海相 Neomonoceratina dongtaiensis Yang et Chen东台新单角介 海相 Sinocytheridea impressa (Brady) 凹陷中华美花介 广盐性种 WT29 Cushmanidea japonica Hanai日本库士曼介 海相 Cushmanidea triangulate Hou三角库士曼介 海相 Sinocyther ideaimpressa (Brady) 凹陷中华美花介 广盐性种 Sinocythere dongtaiensis Yang et Chen东台中华花介 海相 Tanella opima Chen丰满陈氏介 海相 WT30 Hemicytherura tricarinata Hanai三肋半尾花介 海相 Sinocythere dongtaiensis Yang et Chen东台中华花介 海相 WT31 Loxoconcha binhaiensis Ho滨海弯背介 海相 Sinocytheridea impressa (Brady) 凹陷中华美花介 广盐性种 Sinocythere dongtaiensis Yang et Chen东台中华花介 海相 WT52 Candoniella extensa Bojie伸长小玻璃介 沟、溪、池 WT67 Aurila uranouechiensis Ishizaki 浦野内耳形介 海相 Ilyocypris kaifengensis Lee开封土星介 溪、沟、池 WT77 Candonasp. 玻璃介未定种(破损) 沟、溪、池 Eucypris inflata (Sars) 胖真星介 河、湖 Ilyocypris manasensis Mandelstam玛纳斯土星介 溪、沟、池 Ilyocypris biplicata 双折土星介 溪、沟、池 WT79 Candona jucundus Yuan适意玻璃介 沟、溪、池 Ilyocypris biplicata 双折土星介 溪、沟、池 WT85 Candoniella mirabilis 奇异小玻璃介 溪、沟、池 WT117 Ilyocypris biplicata 双折土星介 溪、沟、池 表 2 ZK10 孔AMS 14C 测年数据
Table 2 AMS 14C dating results of Borehole ZK10
序号 样品编号 实验室编号 测年物质 深度/m 惯用年龄/BP 校正年龄/cal BP 1σ范围 2σ范围 中值概率 1 ZK1014C-1 BA130451 淤泥质粘土 15.7 24900±80 29027~28778 19199~28665 28912 2 ZK1014C-4 BA130452 淤泥质粘土 16.2 24920±80 29051~28794 29229~28681 28933 -
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